四氯化碳(CCl4)诱导的小鼠肝纤维化和肝硬化是被广泛接受的研究肝纤维化和肝硬化的实验模型。它在许多方面反映了与毒性损伤相关的人类疾病模式,如α-SMA表达、星状细胞活化和关键基质成分(包括胶原蛋白-1、基质金属蛋白酶及其抑制剂TIMPs)已在该模型的发病机制中得到证实。CCl4诱导在肝脏中引起可重现的和可预测的纤维化反应,使其成为抗纤维化和抗肝硬化治疗的临床前药理学研究和肝纤维化-肝硬化-肝癌变化的病理生理学研究的宝贵基础。
四氯化碳(CCl4)诱导的NASH模型。8周龄的雄性C57BL/6小鼠腹腔注射CCl4,浓度分别为:0.25、0.5和0.75 mL/kg,每周2次。分别诱导4周、6周和8周后进行血生化及组织学染色分析。(A)CCl4诱导NASH模型方案示意图;(B)小鼠体重;(C-D)分别诱导6周和8周的肝脏重量与体重的比值。结果显示:CCl4诱导组与对照组相比,肝脏重量明显增加。数据为平均值±SEM,n = 5。
四氯化碳(CCl4)诱导的NASH模型小鼠肝组织切片染色结果。(A)不同浓度(0.25 mL/kg、0.5 mL/kg、0.75 mL/kg)CCl4分别诱导4周、6周和8周后,对肝组织切片进行HE染色;(B)肝巨噬细胞(枯否细胞)的标志物F4/80的免疫组化检测。结果显示:CCl4诱导组与对照组相比,肝组织切片HE染色显示广泛的肝细胞脂肪变性、气球样变和小叶内炎症;肝巨噬细胞数量显著增加。以上都是NASH的典型病理变化。数据为平均值±SEM,n = 5。
四氯化碳(CCl4)诱导的NASH模型小鼠肝纤维化检测结果。不同浓度(0.25 mL/kg、0.5 mL/kg、0.75 mL/kg)CCl4分别诱导4周、6周和8周后,制作肝组织切片。(A-B)肝组织切片天狼星红染色及肝纤维化程度统计;(C-D)肝成纤维细胞的标志物α-SMA的免疫组化检测。结果显示:CCl4诱导组与对照组相比,肝组织天狼星红染色显示明显的肝纤维化;肝成纤维细胞明显增多。以上结果说明CCl4诱导能成功建立NASH小鼠模型。数据为平均值±SEM,n = 5。
参考文献
1. Scholten, D., Trebicka, J., Liedtke, C. & Weiskirchen, R. The carbon tetrachloride model in mice. Lab Anim 49, 4-11 (2015).
2. Hernandez-Perez, E., Leon Garcia, P.E., Lopez-Diazguerrero, N.E., Rivera-Cabrera, F. & Del Angel Benitez, E. Liver steatosis and nonalcoholic steatohepatitis: from pathogenesis to therapy. Medwave 16, e6535 (2016).
3. Tsuchida, T., et al. A simple diet- and chemical-induced murine NASH model with rapid progression of steatohepatitis, fibrosis and liver cancer. J Hepatol 69, 385-395 (2018).
4. Farrell, G., et al. Mouse Models of Nonalcoholic Steatohepatitis: Toward Optimization of Their Relevance to Human Nonalcoholic Steatohepatitis. Hepatology 69, 2241-2257 (2019).
Establishment of Bile duct ligation induced liver fibrosis model
Liver fibrosis model by bile duct ligation (A) ALT, AST, ALP, GGT and TBIL levels in serum.(B)Representative appearance of livers 4 weeks after BDL. Values are expressed as mean ± SEM. *p<0.05, ***p<0.001, ****p<0.0001.
Histologic Assessment of Bile duct ligation induced liver fibrosis model
H&E and Sirius red staining after Bile duct ligation 4 weeks (A) Representative pictures of H&E staining. (B) Representative pictures of sirius red staining showing increased liver fibrosis. (C) Positive signal area of collagen fiber. Values are expressed as mean ± SEM. *p<0.05.
Establishment of TAA-induced liver fibrosis model
TAA induced liver fibrosis model for 4/6 weeks. (A-B) ALT and AST levels in serum. (C) Representative pictures of H&E staining. (D-E) Representative images of immunohistochemical staining showing α-SMA and positive area(G-F) Representative pictures of sirius red staining showing increased liver fibrosis and positive area. Values are expressed as mean ± SEM. *p<0.05, **p<0.01, ***p<0.001, ****p<0.0001.